While I am not about to suggest that you break any state or federal laws, There are other, heavier weapons that can be quickly easily constructed in dire circumstances should the situation require them. It just takes alittle forethought in aquiring "dual use" items. Seamless, "drawn over mandrel" pipe can be used as fence posts. Currently, there are no federal & damned few state laws against building or posessing flame producing devices. (please check YOUR state) Hobby rockets & aluminum tube open whole new horizons to a fertile imagination.

Ragnar Benson has a few books that elaberate my point further.
Try "Davids tool kit" or his big book of homemade weapons.
Unless you like the idea of being a newlywed bride in cell block B, DO NOT attempt building anything that violates the law in your AO. Just do your homework for now & gather useful items while you can